CN205138671U - Ambient temperature measuring device based on sound velocity - Google Patents
Ambient temperature measuring device based on sound velocity Download PDFInfo
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- CN205138671U CN205138671U CN201520856684.5U CN201520856684U CN205138671U CN 205138671 U CN205138671 U CN 205138671U CN 201520856684 U CN201520856684 U CN 201520856684U CN 205138671 U CN205138671 U CN 205138671U
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- loudspeaker
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- measuring device
- ambient temperature
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Abstract
The utility model discloses an ambient temperature measuring device based on sound velocity, including insulating substrate, the last support stand that is provided with of insulating substrate, the upper portion of support stand is provided with the support flat board, and the support flat board is provided with electret microphone through the location stand, and the last loudspeaker that are provided with of insulating substrate, loudspeaker are located electret microphone under. Insulating substrate is last still to be provided with two terminals, and one of them terminal passes through the cable to be connected with loudspeaker, and another terminal passes through the cable and is connected with electret microphone. The utility model discloses simple structure uses portably, and the real -time detection effect is accurate, is applicable to some comparatively temperature measurement under the adverse circumstances.
Description
Technical field
The utility model belongs to applications of sound waves technical field, is specifically related to a kind of ambient temperature measuring device based on velocity of sound, is applicable to the real-time measurement to temperature in varying environment.
Background technology
At present, the measurement of temperature and the daily life of the mankind closely bound up, relate to a lot of aspects of industrial and agricultural production.In the occasion that some environment are more severe, as high temperature coal stove, oil-fired power plant, high-temperature flue gas, chemical article recovery boiler, nuclear radiation field etc., acquisition and feedback environment temperature are vital to production operation in time.Common contact temperature-measuring method cannot detect the temperature of environmental interior real-time and accurately, even can damage the serviceable life of sensing element.
Summary of the invention
The purpose of this utility model is to provide a kind of ambient temperature measuring device based on velocity of sound, and this device can measure the Temperature numerical of surrounding medium easily, to meet the demand of commercial production life.This apparatus structure is simplified, easy to use, and measurement effect is sensitive stable, is applicable to the mensuration to temperature within the scope of certain space.
In order to realize above-mentioned task, the utility model adopts following technical measures:
A kind of ambient temperature measuring device based on velocity of sound, comprise insulating base, insulating base is provided with bracket upright post, the top of bracket upright post is provided with support plate, support plate is provided with Electret condenser microphone by positioning vertical column, insulating base is provided with loudspeaker, and loudspeaker are positioned at immediately below Electret condenser microphone.
Insulating base as above is also provided with two binding posts, one of them binding post is connected with loudspeaker by cable, and another binding post is connected with Electret condenser microphone by cable.
A kind of ambient temperature measuring device based on velocity of sound, also comprise crystal oscillator, crystal oscillator is connected with the input end of frequency dividing circuit by amplitude amplifier, frequency dividing circuit one tunnel is exported and is connected with loudspeaker by filtering circuit, power amplification circuit successively, another road of frequency dividing circuit exports and is connected with DLC (digital logic circuit), described Electret condenser microphone is connected with DLC (digital logic circuit) by zero passage inspection circuit, and DLC (digital logic circuit) is connected with integrating circuit, and integrating circuit is connected with single-chip microcomputer.
Integrating circuit as above comprises constant current source, No. 1 analog switch, AND circuit, electric capacity, No. 2 analog switches and discharge resistance, constant current source is connected with electric capacity by No. 1 analog switch, the output terminal of AND circuit is connected with the control end of No. 1 analog switch, one road input end of AND circuit is connected with DLC (digital logic circuit), another road input end of AND circuit is connected with single-chip microcomputer, the electric capacity AD sampling module built-in with single-chip microcomputer is connected, electric capacity is also connected with discharge resistance by No. 2 analog switches, and the control end of No. 2 analog switches is connected with single-chip microcomputer.
The utility model compared with prior art, has the following advantages and effect:
1, the environment temperature real-time monitoring device based on velocity of sound is a kind of contactless thermometry, can adapt to, comparatively under rugged environment, can realize the measurement of real-time, dynamic, be convenient to realize automatic monitoring effect.
2, based on the thermometric mode of velocity of sound compared with other contactless temperature-measuring mode, because sound wave is mechanical wave, as long as there is the place of medium, sound wave can pass through, measurement range wide (not limiting in theory), therefore sound wave can measure the temperature of interior of articles, and this is the feature of other contactless temperature-measuring not available for infrared measurement of temperature and radiation temperature measurement.
3, the gas thermometry of various industrial circle can be widely used in based on the environment temperature real-time monitoring device of velocity of sound, especially the measurement of high temperature gas medium temperature is applicable to, as occasions such as rock gas, coal gas, air, meteorology, auto industry, medical and health care system, energy industry (burning air distribution), heating and ventilation, government utilities (measuring the gas temperature such as oxygen, ozone).
Accompanying drawing explanation
Fig. 1 is the utility model mechanical part structural representation;
Fig. 2 is the utility model circuit part functional-block diagram;
Fig. 3 is the functional-block diagram of the utility model integrating circuit;
Fig. 4 is the control waveform schematic diagram that single-chip microcomputer of the present utility model exports.
Wherein: 1-bracket upright post, 2-support plate, 3-positioning vertical column, 4-Electret condenser microphone, 5-loudspeaker, 6-horn bulb, 7-binding post, 8-insulating base, 9-temperature region to be measured, 10-crystal oscillator, 11-amplitude amplifier, 12-frequency dividing circuit, 13-filtering circuit, 14-power amplification circuit, 15-zero cross detection circuit, 16-DLC (digital logic circuit), 17-integrating circuit, 18-single-chip microcomputer, 19-temperature indicator, 20-constant current source, 21-1 analog switch, 22-AND circuit, 23-electric capacity, 24-AD sampling module, 25-2 analog switch, 26-discharge resistance.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
A kind of ambient temperature measuring device based on velocity of sound, comprise insulating base 8, insulating base 8 is provided with bracket upright post 1, the top of bracket upright post 1 is provided with support plate 2, support plate 2 is provided with Electret condenser microphone 4 by positioning vertical column 3, insulating base 8 is provided with loudspeaker 5, loudspeaker 5 are positioned at immediately below Electret condenser microphone 4.
Insulating base 8 is also provided with two binding posts 7, one of them binding post 7 is connected with loudspeaker 5 by cable, and another binding post 7 is connected with Electret condenser microphone 4 by cable.
A kind of ambient temperature measuring device based on velocity of sound, also comprise crystal oscillator 10, crystal oscillator 10 is connected with the input end of frequency dividing circuit 12 by amplitude amplifier 11, frequency dividing circuit 12 1 tunnel is exported and is connected with loudspeaker 5 by filtering circuit 13, power amplification circuit 14 successively, another road of frequency dividing circuit 12 exports and is connected with DLC (digital logic circuit) 16, described Electret condenser microphone 4 is connected with DLC (digital logic circuit) 16 by zero passage inspection circuit 15, DLC (digital logic circuit) 16 is connected with integrating circuit 17, and integrating circuit 17 is connected with single-chip microcomputer 18.
Integrating circuit 17 comprises constant current source 20, No. 1 analog switch 21, AND circuit 22, electric capacity 23, No. 2 analog switches 25 and discharge resistance 26, constant current source 20 is connected with electric capacity 23 by No. 1 analog switch 21, the output terminal of AND circuit 22 is connected with the control end of No. 1 analog switch 21, one road input end of AND circuit 22 is connected with DLC (digital logic circuit) 16, another road input end of AND circuit 22 is connected with single-chip microcomputer 18, the electric capacity 23 AD sampling module built-in with single-chip microcomputer 18 is connected, electric capacity 23 is also connected with discharge resistance 26 by No. 2 analog switches 25, the control end of No. 2 analog switches 25 is connected with single-chip microcomputer 18.
As shown in Fig. 1 ~ 2, a kind of ambient temperature measuring device based on velocity of sound, comprises loudspeaker 5, also comprises Electret condenser microphone 4, and loudspeaker 5 are fixed on the center of horn bulb 6.Be Electret condenser microphone 4 directly over loudspeaker 5, Electret condenser microphone 4 is fixed on the center line lower position of support plate 2 by positioning vertical column 3, and bracket upright post 1 comprises two identical columns, two symmetrical common support support plates 2 of column.The center line of Electret condenser microphone 5 and the center line of loudspeaker 5 are positioned in same vertical line, are region 9 to be measured between loudspeaker 5 and Electret condenser microphone 4.Drive singal and Received signal strength are connected with two binding posts 7 be arranged on above insulating base 8 respectively.
Crystal oscillator 10 can produce the high-frequency signal that frequency is 6M, by amplitude amplifier 11, the amplitude of high-frequency signal is amplified to the scope of setting, so that follow-up work for the treatment of.High-frequency signal after amplification carries out frequency division by frequency dividing circuit 12, the fractional frequency signal that frequency is 15kHz can be obtained, this fractional frequency signal is divided into two-way to send to filtering circuit 13 and DLC (digital logic circuit) 16 respectively, the first via after filtering circuit 13 by amplify after high-frequency signal in frequency in the filtering of more than 20k higher hamonic wave, obtain sine wave.Sinusoidal wave after power amplification 14, obtain drive singal, drive singal is transmitted to loudspeaker 5 and drives it to send sound wave, sound wave can be received by Electret condenser microphone 4 after passing through temperature region 9 to be measured, Received signal strength obtains reshaping signal after zero cross detection circuit 15, the frequency of the fractional frequency signal that reshaping signal and frequency dividing circuit 12 export is identical, because sound wave passes the free delay of temperature region to be measured 9 meeting, so reshaping signal falls behind fractional frequency signal phase differential.After DLC (digital logic circuit) 16 receives fractional frequency signal and reshaping signal, generate square wave, square wave frequency is identical with reshaping signal with fractional frequency signal, and the positive pulsewidth of square wave is the length of the dislocation of fractional frequency signal and reshaping signal.Can charge to integral element after square wave access integrating circuit 17, single-chip microcomputer 18 can control the duration of charging simultaneously, now, the pulsewidth of square wave is larger, magnitude of voltage after integrating circuit charging is higher, single-chip microcomputer 18 is gathered magnitude of voltage by built-in AD conversion module again, is drawn the actual temperature value in temperature region 9 to be measured by computing, and by temperature indicator 19 displays temperature value.
As shown in figs. 34, the frequency of charge permission signal is 5Hz, and square wave frequency is 16kHz for the circuit comprising modules of integrating circuit and principle of work, and the positive pulsewidth length of charge permission signal is 40ms.Cycle due to charge permission signal is 3200 times of square-wave cycle, in charge permission signal during positive pulsewidth, have a large amount of square waves and arrive AND circuit 22 successively, the positive pulsewidth of each square wave is the phase differential of fractional frequency signal corresponding to the temperature in Current Temperatures region to be measured 9 and reshaping signal, when the positive pulsewidth of each square wave arrives, AND circuit 22 exports high level immediately, make No. 1 analog switch 21 open-minded, constant current source 20 charges to electric capacity 23, during the positive pulsewidth of charge permission signal, the product of the square wave arrival quantity of AND circuit 22 and the length of the positive pulsewidth of square-wave signal is considered as the time of capacitor charging, the electric current exported due to constant current source 20 is constant, therefore the quantity of electric charge that stores of electric capacity 23 and the positive terminal voltage value of electric capacity 23 and the duration of charging proportional.After charge permission signal sets low, No. 1 analog switch 21 turns off immediately, charging link stops, capacitance voltage is now a steady state value, gather capacitance voltage value by the built-in AD sampling module 24 of single-chip microcomputer 18, pass through capacitance voltage corresponding to measuring tempeature region to be measured 9 different temperatures in early stage, temperature-voltage form can be obtained, or temperature-voltage function, the capacitance voltage value then by collecting is scaled the current temperature value in corresponding temperature region 9 to be measured.Subsequently, electric discharge allows signal to set high, make No. 2 analog switches 25 open-minded, the electricity stored in electric capacity 23 is released rapidly by discharge resistance 26, electric charge all can be released through the time of about 10ms, capacitance voltage reduces to null value, so far, a complete working period of integrating circuit formally terminates, and starts the charging process waited for next time.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various amendment or supplements or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present utility model or surmount the scope that appended claims defines.
Claims (4)
1. the ambient temperature measuring device based on velocity of sound, comprise insulating base (8), it is characterized in that, insulating base (8) is provided with bracket upright post (1), the top of bracket upright post (1) is provided with support plate (2), support plate (2) is provided with Electret condenser microphone (4) by positioning vertical column (3), insulating base (8) is provided with loudspeaker (5), and loudspeaker (5) are positioned at immediately below Electret condenser microphone (4).
2. a kind of ambient temperature measuring device based on velocity of sound according to claim 1, it is characterized in that, described insulating base (8) is also provided with two binding posts (7), one of them binding post (7) is connected with loudspeaker (5) by cable, and another binding post (7) is connected with Electret condenser microphone (4) by cable.
3. a kind of ambient temperature measuring device based on velocity of sound according to claim 1, it is characterized in that, also comprise crystal oscillator (10), crystal oscillator (10) is connected by the input end of amplitude amplifier (11) with frequency dividing circuit (12), frequency dividing circuit (12) one tunnel exports successively by filtering circuit (13), power amplification circuit (14) is connected with loudspeaker (5), frequency dividing circuit (12) another road exports and is connected with DLC (digital logic circuit) (16), described Electret condenser microphone (4) is examined circuit (15) by zero passage and is connected with DLC (digital logic circuit) (16), DLC (digital logic circuit) (16) is connected with integrating circuit (17), integrating circuit (17) is connected with single-chip microcomputer (18).
4. a kind of ambient temperature measuring device based on velocity of sound according to claim 3, it is characterized in that, described integrating circuit (17) comprises constant current source (20), No. 1 analog switch (21), AND circuit (22), electric capacity (23), No. 2 analog switches (25) and discharge resistance (26), constant current source (20) is connected with electric capacity (23) by No. 1 analog switch (21), the output terminal of AND circuit (22) is connected with the control end of No. 1 analog switch (21), one road input end of AND circuit (22) is connected with DLC (digital logic circuit) (16), another road input end of AND circuit (22) is connected with single-chip microcomputer (18), electric capacity (23) the AD sampling module built-in with single-chip microcomputer (18) is connected, electric capacity (23) is also connected with discharge resistance (26) by No. 2 analog switches (25), the control end of No. 2 analog switches (25) is connected with single-chip microcomputer (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520856684.5U CN205138671U (en) | 2015-10-29 | 2015-10-29 | Ambient temperature measuring device based on sound velocity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520856684.5U CN205138671U (en) | 2015-10-29 | 2015-10-29 | Ambient temperature measuring device based on sound velocity |
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| CN205138671U true CN205138671U (en) | 2016-04-06 |
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| CN201520856684.5U Expired - Fee Related CN205138671U (en) | 2015-10-29 | 2015-10-29 | Ambient temperature measuring device based on sound velocity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109218952A (en) * | 2018-08-08 | 2019-01-15 | 厦门傅里叶电子有限公司 | Loudspeaker Research on Automatic Measuring System of Temperature and method based on phase change measurement |
-
2015
- 2015-10-29 CN CN201520856684.5U patent/CN205138671U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109218952A (en) * | 2018-08-08 | 2019-01-15 | 厦门傅里叶电子有限公司 | Loudspeaker Research on Automatic Measuring System of Temperature and method based on phase change measurement |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160406 Termination date: 20161029 |
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| CF01 | Termination of patent right due to non-payment of annual fee |